Method for determining a characteristic parameter of a CRP specimen

Abstract

The invention relates to a method for determining at least one characteristic parameter of a CRP specimen ( 3, 4 ), in particular a specimen of prepreg material, for aerospace, comprising the following method steps: presenting the specimen ( 3, 4 ), irradiating the. specimen ( 3, 4 ) with a predetermined spectrum of electromagnetic radiation, recording the interaction between the specimen ( 3, 4 ) and the electromagnetic radiation in a data record ( 20 ) and determining the at least one characteristic parameter from the recorded data record ( 20 ).

1. Method for determining a characteristic parameter of a CRP specimen, in particular a specimen of prepreg material, for aerospace, comprising the following method steps:
 providing the specimen; 
 irradiating the specimen with a spectrum of electromagnetic radiation; 
 recording an interaction intensity between the specimen and the electromagnetic radiation in a data record; and 
 identifying the characteristic parameter from the data record, 
 wherein said interaction intensities assigned to different regions of the specimen, are recorded in the data record, 
 wherein the characteristic parameter comprises at least two of an air content in the specimen, a resin content in the specimen, a surface finish of the specimen, a depth of roving interfaces in the specimen, an air distribution in the specimen and a resin distribution in the specimen, and 
 wherein said assigned interaction intensities coinciding with a predetermined intensity range are added together to determine at least one of the air content, and the resin content in the specimen. 
 
     
     
       2. The method according to  claim 1 
 wherein said assigned interaction intensities coinciding with a predetermined intensity range are analyzed to determine at least one of the resin distribution and air distribution with respect to their homogeneous distribution in the different regions of the specimen. 
 
     
     
       3. The method according to  claim 1 , wherein the electromagnetic radiation that has interacted with the specimen is passed through a microscope before the recording of the data record. 
     
     
       4. The method according to  claim 1 , wherein the spectrum of the electromagnetic radiation is chosen in the range of visible light. 
     
     
       5. The method according  claim 1 , wherein the data record is recorded with the aid of a CCD camera and stored in a memory device. 
     
     
       6. The method according to  claim 1 , wherein the recorded data record is compared with one or more reference data records, the at least one characteristic parameter being made equal to a predetermined value in dependence on the reference data record that substantially coincides with the recorded data record. 
     
     
       7. The method according to  claim 6 , wherein the reference data records are used as a measure of at least one of the air content in the specimen, the resin content in the specimen, the surface finish of the specimen, the resin distribution and air distribution in the specimen and/or the depth of roving interfaces in the specimen. 
     
     
       8. The method according to  claim 7 , wherein the characteristic parameter is differently weighted in accordance with the scale used. 
     
     
       9. The method according to  claim 8 , wherein a number of characteristic parameters are determined, weighted and added together, the sum being used as a measure of the quality of the specimen. 
     
     
       10. The method according to  claim 1 , wherein a side face of the specimen is irradiated with electromagnetic radiation, CRP fibers running substantially perpendicular to the side face.